.

topo-B-A-C.sh

-#!/bin/bash
+#!/bin/bash -ex
 # topo B-A-C creates the following network topology:
 #
 #
-#    netns=B          netns=A         netns=C
+#    netns:B          netns:A         netns:C
 #
 #       B  --- br0 ---  A  --- br1 ---  C
 #        b1           a1 a2           c1
@@ -13,17 +13,53 @@
 #
 # Based on https://github.com/troglobit/smcroute/tree/master/test
 
+rm -f A B C
 touch A B C
 PID=$$
 
+
+unshare --net=B -- ip link set lo up
+nsenter --net=B -- ip link add b1 type veth peer B1
+nsenter --net=B -- ip link set B1 netns $PID
+nsenter --net=B -- ip link set b1 up
+ip link set B1 up
+
+unshare --net=A -- ip link set lo up
+nsenter --net=A -- ip link add a1 type veth peer A1
+nsenter --net=A -- ip link set A1 netns $PID
+nsenter --net=A -- ip link set a1 up
+ip link set A1 up
+
+ip link add br0 type bridge # vlan_filtering 1 mcast_snooping 0
+ip link set B1 master br0
+ip link set A1 master br0
+ip link set br0 up
+
+
+nsenter --net=B -- ip addr add 10.0.0.1/24 dev b1
+nsenter --net=A -- ip addr add 10.0.0.2/24 dev a1
+
+nsenter --net=B -- ip route add 224.0.0.0/4 dev b1
+
+nsenter --net=A -- ip route add 224.0.0.0/4 dev a1
+
+
+
+nsenter --net=B -- xfce4-terminal --title=B &
+nsenter --net=A -- xfce4-terminal --title=A &
+
+
+
+
+exit 0
+
 ip link add br0 type bridge     # vlan_filtering 1 mcast_snooping 0
-ip link add type a1 veth peer b1
+ip link add a1 type veth peer b1
 ip link set b1 master br0
 ip link set a1 up
 ip link set b1 up
 ip link set br0 up
 
-
 unshare --net=B -- ip link set lo up
 nsenter --net=B -- ip link add B1 type veth peer B
 nsenter --net=B -- ip link set B netns $PID